1. Institute for Biomedical Research, Georg-Speyer-Haus, Frankfurt/Main, Germany, and Institute for Transfusion Medicine and Immunohematology, Red Cross Blood Donor Service Hessen, D-60596 Frankfurt/Main, Germany
2. Institute for Transfusion Medicine and Immunohematology, Red Cross Blood Donor Service Hessen, D-60596 Frankfurt/Main, Germany
3. Institute for Biomedical Research, Georg-Speyer-Haus, Frankfurt/Main, Germany